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Bevel box grease ? #752225
15/08/22 12:55 PM
15/08/22 12:55 PM
Joined: Aug 2013
Posts: 1,530
Cheshire, UK
nippymog Offline OP
Talk Morgan Enthusiast
nippymog  Offline OP
Talk Morgan Enthusiast

Joined: Aug 2013
Posts: 1,530
Cheshire, UK
On the Morgan Three Wheeler Racing facebook page recently someone asked a question what grease they used in the bevel boxes of their Morgans.
This is the old 2 and 3 speeder Morgans, not 5 speeders.
A reply came back:
"He used to use Castrol Impérvia MMO which was brilliant. No longer available. For the past 10 years he has been using a semi fluid grease Millers Delta 00EP (see photo). It seems to work fine and does not leak out much". I am ignoring the leak comment for the moment !

Now I am very aware early 5 speeder quaif boxes had what was described at the time as 'a brown gunky grease' supplied on delivery , with poor results.
To my knowledge it was never determined exactly what this was, most owners flushing it out, and replacing with heavy oils which I still use to date.

Having done some research ( i.e. googling about ) on applications for semi fluid grease, motor applications do include differentials and bevel boxes.
The EP stands for extreme pressure, like the oils we are used to.
The 00 in front of the EP is the grade of the grease, the NLGI number ( National Lubricating Grease Number) .

From Wikipedia a simplified table of grease grades is available.

NLGI number Appearance Consistency food analog
000 fluid cooking oil
00 semi-fluid apple sauce
0 very soft brown mustard
1 soft tomato paste
2 "normal" grease peanut butter
3 firm vegetable shortening
4 very firm frozen yogurt
5 hard smooth pâté
6. very hard cheddar cheese

I am wondering if the first generation of quiafe boxes were filled with too hard a grease, which didnt lubricate sufficiently.
And would a lower NLGI number with a semi fluid consistency , as used by the older Morgan racers, might be beneficial and quieten and cool things down a bit?
I am very temped at next oil change too try some 00EP as a controlled experiment , a brown mustard or even apple sauce !!!!

I was wondering if anyone has been down this route before and tried semi fluid grease in a quaif box, rather than oil ?


Re: Bevel box grease ? [Re: nippymog] #752257
15/08/22 04:14 PM
15/08/22 04:14 PM
Joined: Feb 2016
Posts: 5,270
East Harling, Norfolk UK
RichardV6 Offline
Charter Member
RichardV6  Offline
Charter Member

Joined: Feb 2016
Posts: 5,270
East Harling, Norfolk UK
As an ex M3W owner I assumed the grease found in new BB's was put in for break-in purposes. Certainly there was no mention of using any form grease in the service section of handbook. Since the crown wheel and pinion are in a bath of transmission oil there are no advantages to be gained from the stiction of grease since lubrication will be near instant. Heat dissipation will also be superior with oil compared with any form of grease.

Having said this the Burman gearbox on a Vincent I once owned specified mixture of grease and EP90. I assumed the former was to assist in smoother gear selection. The large series Land Rover front swivels also benefit from semi-liquid grease when seals are a little worn, but that's for lube retension when the EP90 drips out a little too freely.


2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
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Re: Bevel box grease ? [Re: nippymog] #752265
15/08/22 05:18 PM
15/08/22 05:18 PM
Joined: May 2011
Posts: 1,453
Near Windsor Berkshire
Rog G Offline
Has a lot to Say!
Rog G  Offline
Has a lot to Say!

Joined: May 2011
Posts: 1,453
Near Windsor Berkshire
Not sure about 2 speeders but as far as I am aware the 3 speeders have only ever used oil. I use Castrol D140 in mine. The gear box and bevel box share the same housing and hence oil. People may have used a “grease” to prevent leaks as the gear change mechanism is below the surface of the oil and in its original design had no oil seals and the indents on the gear change shafts would pump oil out on each gear change.

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